I just started watching this show and just started the third season. Love the show, but why is it okay to marry a cousin? Robert and Matthew are 3rd cousins, once removed; but still. That means Robert and Matthews father were third cousins, hence the once removed. So I'm not sure if Mary and Matthew would be 3rd cousins twice removed, or if they aren't considered to be related. How far do you have to go before it's acceptable? 2nd, 3rd? I guess it's just weird because she calls him cousin Matthew.